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Knowledge

Facts, science and history of optical illusions.
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Superior mirages

Inferior and Superior Mirages, and Fata Morgana

Squirrel Stereogram

Stereograms

Can animals see optical illusions? Hosico cat shows it with optical illusion rug

Animals and optical illusions

Parquet Floor

parquet floor or dangerous stairs?

Source: DurkleR

This is not a wall-to-blue-wall parquet floor, but actually a very badly designed set of stairs.
Look on the sides and see the notches of the steps.

More optical illusions:

A Whale of a Cloud

Aerial View of a Beach

Floating cat head

Stairs up or down?

Up or Down?

Cats

painting of the ocean

Painting of the Ocean

Clouds